package com.lzs.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.lzs.reggie.common.BaseContext;
import com.lzs.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的路径
        String requestURI = request.getRequestURI();
        log.info("拦截请求：{} ",request.getRequestURI());
        //定义不需要请求的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送验证码
                "/user/login"//移动端登录
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //check==true，不需要处理
        if (check){
            log.info("本次请求：{}不需要处理 ",request.getRequestURI());
            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登陆,用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            long id =Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登陆,用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            long id =Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        //如果未登录则返回登录结果，通过输出流向客户端响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI){
        for (String url :urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
